DSE Model 7000 Series Control and Instrumentation System Operators Manual
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Part No. 057-074 7000 Series OPERATING MANUAL ISSUE 2 02/05/2008 ADM
7 OPERATION (DUAL MUTUAL STANDBY)
NOTE:- Dual Mutual Standby is only available in DSE7000 series V2.0.0 or above.
The following description details the sequences followed by a module containing the standard ‘factory configuration’
modified to allow two controllers to operate in Dual Mutual Standby.
The operating modes are as per Standalone operation with the dual mutual functions detailed below.
Remember that if you have purchased a completed generator set or control panel from your supplier, the module’s
configuration will probably have been changed by them to suit their particular requirements.
Always refer to your configuration source for the exact sequences and timers observed by any particular module in
the field.
Dual Mutual Standby will allow the generators to operate fully automatically, starting and stopping as required with
no user intervention, with the master backed up by the slave.
If a starting request is made, the starting sequence will begin.
Starting requests can be from the following sources:
•
Mains supply out of limits (DSE7220/7320 only)
o
When the mains supply fails, the Master will start its generator. Should the Master fail, the Slave will
be instructed to start and take the load.
•
Activation of an auxiliary input that has been configured to remote start
o
It is usual that both modules are controlled by the same remote start signal. In this instance, the
Master will start its generator. Should the Master fail, the Slave will be instructed to start and take
the load.
o
If the Master running and the Slave is given a remote start signal, the Slave will not start its
generator until the Master generator fails.
•
Activation of the inbuilt exercise scheduler.
o
In dual mutual standby operation the scheduler operates totally independently to the Master/Slave
scheme. Both generators could start, but only one will be allowed to close its load switch to power
the load.
NOTE:- In all operating modes, only one module will be permitted to close its load switching device.
The controller inhibited from closing, will continue to run off load.
Master
Slave
